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// This source code is released into the public domain.
export module nihil.config:read;
import nihil.std;
import nihil.core;
import nihil.posix;
import nihil.ucl;
import :option;
import :store;
namespace nihil::config {
// Load the configuration from a file.
export [[nodiscard]] auto
read_from(std::filesystem::path const &filename) -> std::expected<void, error>
{
// TODO: nihil.ucl should have a way to load UCL from a filename.
auto config_text = std::string();
auto err = read_file(filename, std::back_inserter(config_text));
if (!err) {
// Ignore ENOENT, it simply means we haven't created the
// config file yet, so default values will be used.
if (err.error().root_cause() == std::errc::no_such_file_or_directory)
co_return {};
co_return std::unexpected(error(std::format("cannot read {}", filename.string()), err.error()));
}
// Parse the UCL.
auto uclconfig = co_await ucl::parse(config_text);
for (auto &&[key, value] : uclconfig) {
auto *opt = co_await store::get().fetch(key);
co_await opt->ucl(value);
}
co_return {};
}
} // namespace nihil::config
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